Accession Number : ADA313368

Title :   Solvent Effects on the Surface Composition of Bisphenol A Polycarbonate and Polydimethyl Siloxane (BPAC-DMS) Random Block Copolymers.

Descriptive Note : Technical rept.,

Corporate Author : STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY

Personal Author(s) : Zhuang, H. Z. ; Gardella, J. A., Jr

PDF Url : ADA313368

Report Date : AUG 1996

Pagination or Media Count : 36

Abstract : The surface compositions of bisphenol A polycarbonate and polydimethylsiloxane (BPAC-PDMS) random block copolymers were analyzed using angle-dependent electron spectroscopy for chemical analysis (ESCA) and attenuated total reflection (ATR) FTIR. The composition was measured at sampling depths of 18, 73 and 103 A with angle-dependent ESCA, and at a sampling depth of 4.1 micrometers in with ATR-FTIR. The present study focuses on examining the detailed quantitative effects of solvent-casting and annealing on the surface composition of the BPAC-PDMS random block copolymers of varying bulk compositions. The effects of solvent-casting were evaluated in terms of solvent solubility (or Hildebrand parameter) and solvent volatility (or boiling point). It was found that the casting solvents influenced the surface compositions significantly, and each of them gave the polymer film a different morphology in the near surface region. In addition, a physical picture of the near surface region (103 A) of siloxane block copolymers cast from selected solvents is compared to the thicker region (approx. 4.1 micrometers) probed by ATR-FTIR. p2

Descriptors :   *BLOCK COPOLYMERS, *SILOXANES, *CHEMICAL COMPOSITION, *SURFACES, *SOLVENTS, *POLYCARBONATES, ANNEALING, METHYL RADICALS, POLYMERIC FILMS, SAMPLING, VOLATILITY, CASTING, SOLUBILITY, ELECTRON SPECTROSCOPY, CHEMICAL ANALYSIS, BOILING POINT.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE